2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2014, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include <linux/export.h>
42 #define SS_LISTENING -1 /* socket is listening */
43 #define SS_READY -2 /* socket is connectionless */
45 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
47 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
48 static void tipc_data_ready(struct sock
*sk
);
49 static void tipc_write_space(struct sock
*sk
);
50 static int tipc_release(struct socket
*sock
);
51 static int tipc_accept(struct socket
*sock
, struct socket
*new_sock
, int flags
);
53 static const struct proto_ops packet_ops
;
54 static const struct proto_ops stream_ops
;
55 static const struct proto_ops msg_ops
;
57 static struct proto tipc_proto
;
58 static struct proto tipc_proto_kern
;
61 * Revised TIPC socket locking policy:
63 * Most socket operations take the standard socket lock when they start
64 * and hold it until they finish (or until they need to sleep). Acquiring
65 * this lock grants the owner exclusive access to the fields of the socket
66 * data structures, with the exception of the backlog queue. A few socket
67 * operations can be done without taking the socket lock because they only
68 * read socket information that never changes during the life of the socket.
70 * Socket operations may acquire the lock for the associated TIPC port if they
71 * need to perform an operation on the port. If any routine needs to acquire
72 * both the socket lock and the port lock it must take the socket lock first
73 * to avoid the risk of deadlock.
75 * The dispatcher handling incoming messages cannot grab the socket lock in
76 * the standard fashion, since invoked it runs at the BH level and cannot block.
77 * Instead, it checks to see if the socket lock is currently owned by someone,
78 * and either handles the message itself or adds it to the socket's backlog
79 * queue; in the latter case the queued message is processed once the process
80 * owning the socket lock releases it.
82 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
83 * the problem of a blocked socket operation preventing any other operations
84 * from occurring. However, applications must be careful if they have
85 * multiple threads trying to send (or receive) on the same socket, as these
86 * operations might interfere with each other. For example, doing a connect
87 * and a receive at the same time might allow the receive to consume the
88 * ACK message meant for the connect. While additional work could be done
89 * to try and overcome this, it doesn't seem to be worthwhile at the present.
91 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
92 * that another operation that must be performed in a non-blocking manner is
93 * not delayed for very long because the lock has already been taken.
95 * NOTE: This code assumes that certain fields of a port/socket pair are
96 * constant over its lifetime; such fields can be examined without taking
97 * the socket lock and/or port lock, and do not need to be re-read even
98 * after resuming processing after waiting. These fields include:
100 * - pointer to socket sk structure (aka tipc_sock structure)
101 * - pointer to port structure
108 * advance_rx_queue - discard first buffer in socket receive queue
110 * Caller must hold socket lock
112 static void advance_rx_queue(struct sock
*sk
)
114 kfree_skb(__skb_dequeue(&sk
->sk_receive_queue
));
118 * reject_rx_queue - reject all buffers in socket receive queue
120 * Caller must hold socket lock
122 static void reject_rx_queue(struct sock
*sk
)
126 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
)))
127 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
131 * tipc_sk_create - create a TIPC socket
132 * @net: network namespace (must be default network)
133 * @sock: pre-allocated socket structure
134 * @protocol: protocol indicator (must be 0)
135 * @kern: caused by kernel or by userspace?
137 * This routine creates additional data structures used by the TIPC socket,
138 * initializes them, and links them together.
140 * Returns 0 on success, errno otherwise
142 static int tipc_sk_create(struct net
*net
, struct socket
*sock
,
143 int protocol
, int kern
)
145 const struct proto_ops
*ops
;
148 struct tipc_sock
*tsk
;
149 struct tipc_port
*port
;
152 /* Validate arguments */
153 if (unlikely(protocol
!= 0))
154 return -EPROTONOSUPPORT
;
156 switch (sock
->type
) {
159 state
= SS_UNCONNECTED
;
163 state
= SS_UNCONNECTED
;
174 /* Allocate socket's protocol area */
176 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
);
178 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto_kern
);
186 ref
= tipc_port_init(port
, TIPC_LOW_IMPORTANCE
);
188 pr_warn("Socket registration failed, ref. table exhausted\n");
193 /* Finish initializing socket data structures */
197 sock_init_data(sock
, sk
);
198 sk
->sk_backlog_rcv
= backlog_rcv
;
199 sk
->sk_rcvbuf
= sysctl_tipc_rmem
[1];
200 sk
->sk_data_ready
= tipc_data_ready
;
201 sk
->sk_write_space
= tipc_write_space
;
202 tipc_sk(sk
)->conn_timeout
= CONN_TIMEOUT_DEFAULT
;
203 tipc_port_unlock(port
);
205 if (sock
->state
== SS_READY
) {
206 tipc_port_set_unreturnable(port
, true);
207 if (sock
->type
== SOCK_DGRAM
)
208 tipc_port_set_unreliable(port
, true);
214 * tipc_sock_create_local - create TIPC socket from inside TIPC module
215 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
217 * We cannot use sock_creat_kern here because it bumps module user count.
218 * Since socket owner and creator is the same module we must make sure
219 * that module count remains zero for module local sockets, otherwise
220 * we cannot do rmmod.
222 * Returns 0 on success, errno otherwise
224 int tipc_sock_create_local(int type
, struct socket
**res
)
228 rc
= sock_create_lite(AF_TIPC
, type
, 0, res
);
230 pr_err("Failed to create kernel socket\n");
233 tipc_sk_create(&init_net
, *res
, 0, 1);
239 * tipc_sock_release_local - release socket created by tipc_sock_create_local
240 * @sock: the socket to be released.
242 * Module reference count is not incremented when such sockets are created,
243 * so we must keep it from being decremented when they are released.
245 void tipc_sock_release_local(struct socket
*sock
)
253 * tipc_sock_accept_local - accept a connection on a socket created
254 * with tipc_sock_create_local. Use this function to avoid that
255 * module reference count is inadvertently incremented.
257 * @sock: the accepting socket
258 * @newsock: reference to the new socket to be created
259 * @flags: socket flags
262 int tipc_sock_accept_local(struct socket
*sock
, struct socket
**newsock
,
265 struct sock
*sk
= sock
->sk
;
268 ret
= sock_create_lite(sk
->sk_family
, sk
->sk_type
,
269 sk
->sk_protocol
, newsock
);
273 ret
= tipc_accept(sock
, *newsock
, flags
);
275 sock_release(*newsock
);
278 (*newsock
)->ops
= sock
->ops
;
283 * tipc_release - destroy a TIPC socket
284 * @sock: socket to destroy
286 * This routine cleans up any messages that are still queued on the socket.
287 * For DGRAM and RDM socket types, all queued messages are rejected.
288 * For SEQPACKET and STREAM socket types, the first message is rejected
289 * and any others are discarded. (If the first message on a STREAM socket
290 * is partially-read, it is discarded and the next one is rejected instead.)
292 * NOTE: Rejected messages are not necessarily returned to the sender! They
293 * are returned or discarded according to the "destination droppable" setting
294 * specified for the message by the sender.
296 * Returns 0 on success, errno otherwise
298 static int tipc_release(struct socket
*sock
)
300 struct sock
*sk
= sock
->sk
;
301 struct tipc_sock
*tsk
;
302 struct tipc_port
*port
;
306 * Exit if socket isn't fully initialized (occurs when a failed accept()
307 * releases a pre-allocated child socket that was never used)
317 * Reject all unreceived messages, except on an active connection
318 * (which disconnects locally & sends a 'FIN+' to peer)
320 while (sock
->state
!= SS_DISCONNECTING
) {
321 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
324 if (TIPC_SKB_CB(buf
)->handle
!= NULL
)
327 if ((sock
->state
== SS_CONNECTING
) ||
328 (sock
->state
== SS_CONNECTED
)) {
329 sock
->state
= SS_DISCONNECTING
;
330 tipc_port_disconnect(port
->ref
);
332 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
336 /* Destroy TIPC port; also disconnects an active connection and
337 * sends a 'FIN-' to peer.
339 tipc_port_destroy(port
);
341 /* Discard any remaining (connection-based) messages in receive queue */
342 __skb_queue_purge(&sk
->sk_receive_queue
);
344 /* Reject any messages that accumulated in backlog queue */
345 sock
->state
= SS_DISCONNECTING
;
355 * tipc_bind - associate or disassocate TIPC name(s) with a socket
356 * @sock: socket structure
357 * @uaddr: socket address describing name(s) and desired operation
358 * @uaddr_len: size of socket address data structure
360 * Name and name sequence binding is indicated using a positive scope value;
361 * a negative scope value unbinds the specified name. Specifying no name
362 * (i.e. a socket address length of 0) unbinds all names from the socket.
364 * Returns 0 on success, errno otherwise
366 * NOTE: This routine doesn't need to take the socket lock since it doesn't
367 * access any non-constant socket information.
369 static int tipc_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
372 struct sock
*sk
= sock
->sk
;
373 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
374 struct tipc_sock
*tsk
= tipc_sk(sk
);
378 if (unlikely(!uaddr_len
)) {
379 res
= tipc_withdraw(&tsk
->port
, 0, NULL
);
383 if (uaddr_len
< sizeof(struct sockaddr_tipc
)) {
387 if (addr
->family
!= AF_TIPC
) {
392 if (addr
->addrtype
== TIPC_ADDR_NAME
)
393 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
394 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
) {
399 if ((addr
->addr
.nameseq
.type
< TIPC_RESERVED_TYPES
) &&
400 (addr
->addr
.nameseq
.type
!= TIPC_TOP_SRV
) &&
401 (addr
->addr
.nameseq
.type
!= TIPC_CFG_SRV
)) {
406 res
= (addr
->scope
> 0) ?
407 tipc_publish(&tsk
->port
, addr
->scope
, &addr
->addr
.nameseq
) :
408 tipc_withdraw(&tsk
->port
, -addr
->scope
, &addr
->addr
.nameseq
);
415 * tipc_getname - get port ID of socket or peer socket
416 * @sock: socket structure
417 * @uaddr: area for returned socket address
418 * @uaddr_len: area for returned length of socket address
419 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
421 * Returns 0 on success, errno otherwise
423 * NOTE: This routine doesn't need to take the socket lock since it only
424 * accesses socket information that is unchanging (or which changes in
425 * a completely predictable manner).
427 static int tipc_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
428 int *uaddr_len
, int peer
)
430 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
431 struct tipc_sock
*tsk
= tipc_sk(sock
->sk
);
433 memset(addr
, 0, sizeof(*addr
));
435 if ((sock
->state
!= SS_CONNECTED
) &&
436 ((peer
!= 2) || (sock
->state
!= SS_DISCONNECTING
)))
438 addr
->addr
.id
.ref
= tipc_port_peerport(&tsk
->port
);
439 addr
->addr
.id
.node
= tipc_port_peernode(&tsk
->port
);
441 addr
->addr
.id
.ref
= tsk
->port
.ref
;
442 addr
->addr
.id
.node
= tipc_own_addr
;
445 *uaddr_len
= sizeof(*addr
);
446 addr
->addrtype
= TIPC_ADDR_ID
;
447 addr
->family
= AF_TIPC
;
449 addr
->addr
.name
.domain
= 0;
455 * tipc_poll - read and possibly block on pollmask
456 * @file: file structure associated with the socket
457 * @sock: socket for which to calculate the poll bits
460 * Returns pollmask value
463 * It appears that the usual socket locking mechanisms are not useful here
464 * since the pollmask info is potentially out-of-date the moment this routine
465 * exits. TCP and other protocols seem to rely on higher level poll routines
466 * to handle any preventable race conditions, so TIPC will do the same ...
468 * TIPC sets the returned events as follows:
470 * socket state flags set
471 * ------------ ---------
472 * unconnected no read flags
473 * POLLOUT if port is not congested
475 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
478 * connected POLLIN/POLLRDNORM if data in rx queue
479 * POLLOUT if port is not congested
481 * disconnecting POLLIN/POLLRDNORM/POLLHUP
484 * listening POLLIN if SYN in rx queue
487 * ready POLLIN/POLLRDNORM if data in rx queue
488 * [connectionless] POLLOUT (since port cannot be congested)
490 * IMPORTANT: The fact that a read or write operation is indicated does NOT
491 * imply that the operation will succeed, merely that it should be performed
492 * and will not block.
494 static unsigned int tipc_poll(struct file
*file
, struct socket
*sock
,
497 struct sock
*sk
= sock
->sk
;
498 struct tipc_sock
*tsk
= tipc_sk(sk
);
501 sock_poll_wait(file
, sk_sleep(sk
), wait
);
503 switch ((int)sock
->state
) {
505 if (!tsk
->port
.congested
)
510 if (!tsk
->port
.congested
)
515 if (!skb_queue_empty(&sk
->sk_receive_queue
))
516 mask
|= (POLLIN
| POLLRDNORM
);
518 case SS_DISCONNECTING
:
519 mask
= (POLLIN
| POLLRDNORM
| POLLHUP
);
527 * dest_name_check - verify user is permitted to send to specified port name
528 * @dest: destination address
529 * @m: descriptor for message to be sent
531 * Prevents restricted configuration commands from being issued by
532 * unauthorized users.
534 * Returns 0 if permission is granted, otherwise errno
536 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
538 struct tipc_cfg_msg_hdr hdr
;
540 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
542 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
544 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
547 if (!m
->msg_iovlen
|| (m
->msg_iov
[0].iov_len
< sizeof(hdr
)))
549 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
551 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
557 static int tipc_wait_for_sndmsg(struct socket
*sock
, long *timeo_p
)
559 struct sock
*sk
= sock
->sk
;
560 struct tipc_sock
*tsk
= tipc_sk(sk
);
565 int err
= sock_error(sk
);
568 if (sock
->state
== SS_DISCONNECTING
)
572 if (signal_pending(current
))
573 return sock_intr_errno(*timeo_p
);
575 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
576 done
= sk_wait_event(sk
, timeo_p
, !tsk
->port
.congested
);
577 finish_wait(sk_sleep(sk
), &wait
);
584 * tipc_sendmsg - send message in connectionless manner
585 * @iocb: if NULL, indicates that socket lock is already held
586 * @sock: socket structure
587 * @m: message to send
588 * @total_len: length of message
590 * Message must have an destination specified explicitly.
591 * Used for SOCK_RDM and SOCK_DGRAM messages,
592 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
593 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
595 * Returns the number of bytes sent on success, or errno otherwise
597 static int tipc_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
598 struct msghdr
*m
, size_t total_len
)
600 struct sock
*sk
= sock
->sk
;
601 struct tipc_sock
*tsk
= tipc_sk(sk
);
602 struct tipc_port
*port
= &tsk
->port
;
603 DECLARE_SOCKADDR(struct sockaddr_tipc
*, dest
, m
->msg_name
);
609 return -EDESTADDRREQ
;
610 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
611 (dest
->family
!= AF_TIPC
)))
613 if (total_len
> TIPC_MAX_USER_MSG_SIZE
)
619 needs_conn
= (sock
->state
!= SS_READY
);
620 if (unlikely(needs_conn
)) {
621 if (sock
->state
== SS_LISTENING
) {
625 if (sock
->state
!= SS_UNCONNECTED
) {
629 if (tsk
->port
.published
) {
633 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
634 tsk
->port
.conn_type
= dest
->addr
.name
.name
.type
;
635 tsk
->port
.conn_instance
= dest
->addr
.name
.name
.instance
;
638 /* Abort any pending connection attempts (very unlikely) */
642 timeo
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
644 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
645 res
= dest_name_check(dest
, m
);
648 res
= tipc_send2name(port
,
649 &dest
->addr
.name
.name
,
650 dest
->addr
.name
.domain
,
653 } else if (dest
->addrtype
== TIPC_ADDR_ID
) {
654 res
= tipc_send2port(port
,
658 } else if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
663 res
= dest_name_check(dest
, m
);
666 res
= tipc_port_mcast_xmit(port
,
671 if (likely(res
!= -ELINKCONG
)) {
672 if (needs_conn
&& (res
>= 0))
673 sock
->state
= SS_CONNECTING
;
676 res
= tipc_wait_for_sndmsg(sock
, &timeo
);
687 static int tipc_wait_for_sndpkt(struct socket
*sock
, long *timeo_p
)
689 struct sock
*sk
= sock
->sk
;
690 struct tipc_sock
*tsk
= tipc_sk(sk
);
691 struct tipc_port
*port
= &tsk
->port
;
696 int err
= sock_error(sk
);
699 if (sock
->state
== SS_DISCONNECTING
)
701 else if (sock
->state
!= SS_CONNECTED
)
705 if (signal_pending(current
))
706 return sock_intr_errno(*timeo_p
);
708 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
709 done
= sk_wait_event(sk
, timeo_p
,
710 (!port
->congested
|| !port
->connected
));
711 finish_wait(sk_sleep(sk
), &wait
);
717 * tipc_send_packet - send a connection-oriented message
718 * @iocb: if NULL, indicates that socket lock is already held
719 * @sock: socket structure
720 * @m: message to send
721 * @total_len: length of message
723 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
725 * Returns the number of bytes sent on success, or errno otherwise
727 static int tipc_send_packet(struct kiocb
*iocb
, struct socket
*sock
,
728 struct msghdr
*m
, size_t total_len
)
730 struct sock
*sk
= sock
->sk
;
731 struct tipc_sock
*tsk
= tipc_sk(sk
);
732 DECLARE_SOCKADDR(struct sockaddr_tipc
*, dest
, m
->msg_name
);
736 /* Handle implied connection establishment */
738 return tipc_sendmsg(iocb
, sock
, m
, total_len
);
740 if (total_len
> TIPC_MAX_USER_MSG_SIZE
)
746 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
747 if (sock
->state
== SS_DISCONNECTING
)
754 timeo
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
756 res
= tipc_send(&tsk
->port
, m
->msg_iov
, total_len
);
757 if (likely(res
!= -ELINKCONG
))
759 res
= tipc_wait_for_sndpkt(sock
, &timeo
);
770 * tipc_send_stream - send stream-oriented data
772 * @sock: socket structure
774 * @total_len: total length of data to be sent
776 * Used for SOCK_STREAM data.
778 * Returns the number of bytes sent on success (or partial success),
779 * or errno if no data sent
781 static int tipc_send_stream(struct kiocb
*iocb
, struct socket
*sock
,
782 struct msghdr
*m
, size_t total_len
)
784 struct sock
*sk
= sock
->sk
;
785 struct tipc_sock
*tsk
= tipc_sk(sk
);
786 struct msghdr my_msg
;
788 struct iovec
*curr_iov
;
790 char __user
*curr_start
;
799 /* Handle special cases where there is no connection */
800 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
801 if (sock
->state
== SS_UNCONNECTED
)
802 res
= tipc_send_packet(NULL
, sock
, m
, total_len
);
804 res
= sock
->state
== SS_DISCONNECTING
? -EPIPE
: -ENOTCONN
;
808 if (unlikely(m
->msg_name
)) {
813 if (total_len
> (unsigned int)INT_MAX
) {
819 * Send each iovec entry using one or more messages
821 * Note: This algorithm is good for the most likely case
822 * (i.e. one large iovec entry), but could be improved to pass sets
823 * of small iovec entries into send_packet().
825 curr_iov
= m
->msg_iov
;
826 curr_iovlen
= m
->msg_iovlen
;
827 my_msg
.msg_iov
= &my_iov
;
828 my_msg
.msg_iovlen
= 1;
829 my_msg
.msg_flags
= m
->msg_flags
;
830 my_msg
.msg_name
= NULL
;
833 hdr_size
= msg_hdr_sz(&tsk
->port
.phdr
);
835 while (curr_iovlen
--) {
836 curr_start
= curr_iov
->iov_base
;
837 curr_left
= curr_iov
->iov_len
;
840 bytes_to_send
= tsk
->port
.max_pkt
- hdr_size
;
841 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
842 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
843 if (curr_left
< bytes_to_send
)
844 bytes_to_send
= curr_left
;
845 my_iov
.iov_base
= curr_start
;
846 my_iov
.iov_len
= bytes_to_send
;
847 res
= tipc_send_packet(NULL
, sock
, &my_msg
,
854 curr_left
-= bytes_to_send
;
855 curr_start
+= bytes_to_send
;
856 bytes_sent
+= bytes_to_send
;
868 * auto_connect - complete connection setup to a remote port
869 * @tsk: tipc socket structure
870 * @msg: peer's response message
872 * Returns 0 on success, errno otherwise
874 static int auto_connect(struct tipc_sock
*tsk
, struct tipc_msg
*msg
)
876 struct tipc_port
*port
= &tsk
->port
;
877 struct socket
*sock
= tsk
->sk
.sk_socket
;
878 struct tipc_portid peer
;
880 peer
.ref
= msg_origport(msg
);
881 peer
.node
= msg_orignode(msg
);
883 __tipc_port_connect(port
->ref
, port
, &peer
);
885 if (msg_importance(msg
) > TIPC_CRITICAL_IMPORTANCE
)
887 msg_set_importance(&port
->phdr
, (u32
)msg_importance(msg
));
888 sock
->state
= SS_CONNECTED
;
893 * set_orig_addr - capture sender's address for received message
894 * @m: descriptor for message info
895 * @msg: received message header
897 * Note: Address is not captured if not requested by receiver.
899 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
901 DECLARE_SOCKADDR(struct sockaddr_tipc
*, addr
, m
->msg_name
);
904 addr
->family
= AF_TIPC
;
905 addr
->addrtype
= TIPC_ADDR_ID
;
906 memset(&addr
->addr
, 0, sizeof(addr
->addr
));
907 addr
->addr
.id
.ref
= msg_origport(msg
);
908 addr
->addr
.id
.node
= msg_orignode(msg
);
909 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
910 addr
->scope
= 0; /* could leave uninitialized */
911 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
916 * anc_data_recv - optionally capture ancillary data for received message
917 * @m: descriptor for message info
918 * @msg: received message header
919 * @tport: TIPC port associated with message
921 * Note: Ancillary data is not captured if not requested by receiver.
923 * Returns 0 if successful, otherwise errno
925 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
926 struct tipc_port
*tport
)
934 if (likely(m
->msg_controllen
== 0))
937 /* Optionally capture errored message object(s) */
938 err
= msg
? msg_errcode(msg
) : 0;
941 anc_data
[1] = msg_data_sz(msg
);
942 res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
);
946 res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
953 /* Optionally capture message destination object */
954 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
958 anc_data
[0] = msg_nametype(msg
);
959 anc_data
[1] = msg_namelower(msg
);
960 anc_data
[2] = msg_namelower(msg
);
964 anc_data
[0] = msg_nametype(msg
);
965 anc_data
[1] = msg_namelower(msg
);
966 anc_data
[2] = msg_nameupper(msg
);
969 has_name
= (tport
->conn_type
!= 0);
970 anc_data
[0] = tport
->conn_type
;
971 anc_data
[1] = tport
->conn_instance
;
972 anc_data
[2] = tport
->conn_instance
;
978 res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
);
986 static int tipc_wait_for_rcvmsg(struct socket
*sock
, long timeo
)
988 struct sock
*sk
= sock
->sk
;
993 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
994 if (timeo
&& skb_queue_empty(&sk
->sk_receive_queue
)) {
995 if (sock
->state
== SS_DISCONNECTING
) {
1000 timeo
= schedule_timeout(timeo
);
1004 if (!skb_queue_empty(&sk
->sk_receive_queue
))
1006 err
= sock_intr_errno(timeo
);
1007 if (signal_pending(current
))
1013 finish_wait(sk_sleep(sk
), &wait
);
1018 * tipc_recvmsg - receive packet-oriented message
1020 * @m: descriptor for message info
1021 * @buf_len: total size of user buffer area
1022 * @flags: receive flags
1024 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1025 * If the complete message doesn't fit in user area, truncate it.
1027 * Returns size of returned message data, errno otherwise
1029 static int tipc_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1030 struct msghdr
*m
, size_t buf_len
, int flags
)
1032 struct sock
*sk
= sock
->sk
;
1033 struct tipc_sock
*tsk
= tipc_sk(sk
);
1034 struct tipc_port
*port
= &tsk
->port
;
1035 struct sk_buff
*buf
;
1036 struct tipc_msg
*msg
;
1042 /* Catch invalid receive requests */
1043 if (unlikely(!buf_len
))
1048 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
1053 timeo
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1056 /* Look for a message in receive queue; wait if necessary */
1057 res
= tipc_wait_for_rcvmsg(sock
, timeo
);
1061 /* Look at first message in receive queue */
1062 buf
= skb_peek(&sk
->sk_receive_queue
);
1064 sz
= msg_data_sz(msg
);
1065 err
= msg_errcode(msg
);
1067 /* Discard an empty non-errored message & try again */
1068 if ((!sz
) && (!err
)) {
1069 advance_rx_queue(sk
);
1073 /* Capture sender's address (optional) */
1074 set_orig_addr(m
, msg
);
1076 /* Capture ancillary data (optional) */
1077 res
= anc_data_recv(m
, msg
, port
);
1081 /* Capture message data (if valid) & compute return value (always) */
1083 if (unlikely(buf_len
< sz
)) {
1085 m
->msg_flags
|= MSG_TRUNC
;
1087 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
),
1093 if ((sock
->state
== SS_READY
) ||
1094 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
1100 /* Consume received message (optional) */
1101 if (likely(!(flags
& MSG_PEEK
))) {
1102 if ((sock
->state
!= SS_READY
) &&
1103 (++port
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1104 tipc_acknowledge(port
->ref
, port
->conn_unacked
);
1105 advance_rx_queue(sk
);
1113 * tipc_recv_stream - receive stream-oriented data
1115 * @m: descriptor for message info
1116 * @buf_len: total size of user buffer area
1117 * @flags: receive flags
1119 * Used for SOCK_STREAM messages only. If not enough data is available
1120 * will optionally wait for more; never truncates data.
1122 * Returns size of returned message data, errno otherwise
1124 static int tipc_recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
1125 struct msghdr
*m
, size_t buf_len
, int flags
)
1127 struct sock
*sk
= sock
->sk
;
1128 struct tipc_sock
*tsk
= tipc_sk(sk
);
1129 struct tipc_port
*port
= &tsk
->port
;
1130 struct sk_buff
*buf
;
1131 struct tipc_msg
*msg
;
1134 int sz_to_copy
, target
, needed
;
1139 /* Catch invalid receive attempts */
1140 if (unlikely(!buf_len
))
1145 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
1150 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, buf_len
);
1151 timeo
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1154 /* Look for a message in receive queue; wait if necessary */
1155 res
= tipc_wait_for_rcvmsg(sock
, timeo
);
1159 /* Look at first message in receive queue */
1160 buf
= skb_peek(&sk
->sk_receive_queue
);
1162 sz
= msg_data_sz(msg
);
1163 err
= msg_errcode(msg
);
1165 /* Discard an empty non-errored message & try again */
1166 if ((!sz
) && (!err
)) {
1167 advance_rx_queue(sk
);
1171 /* Optionally capture sender's address & ancillary data of first msg */
1172 if (sz_copied
== 0) {
1173 set_orig_addr(m
, msg
);
1174 res
= anc_data_recv(m
, msg
, port
);
1179 /* Capture message data (if valid) & compute return value (always) */
1181 u32 offset
= (u32
)(unsigned long)(TIPC_SKB_CB(buf
)->handle
);
1184 needed
= (buf_len
- sz_copied
);
1185 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1187 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
) + offset
,
1188 m
->msg_iov
, sz_to_copy
);
1192 sz_copied
+= sz_to_copy
;
1194 if (sz_to_copy
< sz
) {
1195 if (!(flags
& MSG_PEEK
))
1196 TIPC_SKB_CB(buf
)->handle
=
1197 (void *)(unsigned long)(offset
+ sz_to_copy
);
1202 goto exit
; /* can't add error msg to valid data */
1204 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1210 /* Consume received message (optional) */
1211 if (likely(!(flags
& MSG_PEEK
))) {
1212 if (unlikely(++port
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1213 tipc_acknowledge(port
->ref
, port
->conn_unacked
);
1214 advance_rx_queue(sk
);
1217 /* Loop around if more data is required */
1218 if ((sz_copied
< buf_len
) && /* didn't get all requested data */
1219 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1220 (sz_copied
< target
)) && /* and more is ready or required */
1221 (!(flags
& MSG_PEEK
)) && /* and aren't just peeking at data */
1222 (!err
)) /* and haven't reached a FIN */
1227 return sz_copied
? sz_copied
: res
;
1231 * tipc_write_space - wake up thread if port congestion is released
1234 static void tipc_write_space(struct sock
*sk
)
1236 struct socket_wq
*wq
;
1239 wq
= rcu_dereference(sk
->sk_wq
);
1240 if (wq_has_sleeper(wq
))
1241 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
1242 POLLWRNORM
| POLLWRBAND
);
1247 * tipc_data_ready - wake up threads to indicate messages have been received
1249 * @len: the length of messages
1251 static void tipc_data_ready(struct sock
*sk
)
1253 struct socket_wq
*wq
;
1256 wq
= rcu_dereference(sk
->sk_wq
);
1257 if (wq_has_sleeper(wq
))
1258 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
1259 POLLRDNORM
| POLLRDBAND
);
1264 * filter_connect - Handle all incoming messages for a connection-based socket
1268 * Returns TIPC error status code and socket error status code
1269 * once it encounters some errors
1271 static u32
filter_connect(struct tipc_sock
*tsk
, struct sk_buff
**buf
)
1273 struct sock
*sk
= &tsk
->sk
;
1274 struct tipc_port
*port
= &tsk
->port
;
1275 struct socket
*sock
= sk
->sk_socket
;
1276 struct tipc_msg
*msg
= buf_msg(*buf
);
1278 u32 retval
= TIPC_ERR_NO_PORT
;
1284 switch ((int)sock
->state
) {
1286 /* Accept only connection-based messages sent by peer */
1287 if (msg_connected(msg
) && tipc_port_peer_msg(port
, msg
)) {
1288 if (unlikely(msg_errcode(msg
))) {
1289 sock
->state
= SS_DISCONNECTING
;
1290 __tipc_port_disconnect(port
);
1296 /* Accept only ACK or NACK message */
1297 if (unlikely(msg_errcode(msg
))) {
1298 sock
->state
= SS_DISCONNECTING
;
1299 sk
->sk_err
= ECONNREFUSED
;
1304 if (unlikely(!msg_connected(msg
)))
1307 res
= auto_connect(tsk
, msg
);
1309 sock
->state
= SS_DISCONNECTING
;
1315 /* If an incoming message is an 'ACK-', it should be
1316 * discarded here because it doesn't contain useful
1317 * data. In addition, we should try to wake up
1318 * connect() routine if sleeping.
1320 if (msg_data_sz(msg
) == 0) {
1323 if (waitqueue_active(sk_sleep(sk
)))
1324 wake_up_interruptible(sk_sleep(sk
));
1329 case SS_UNCONNECTED
:
1330 /* Accept only SYN message */
1331 if (!msg_connected(msg
) && !(msg_errcode(msg
)))
1334 case SS_DISCONNECTING
:
1337 pr_err("Unknown socket state %u\n", sock
->state
);
1343 * rcvbuf_limit - get proper overload limit of socket receive queue
1347 * For all connection oriented messages, irrespective of importance,
1348 * the default overload value (i.e. 67MB) is set as limit.
1350 * For all connectionless messages, by default new queue limits are
1353 * TIPC_LOW_IMPORTANCE (4 MB)
1354 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1355 * TIPC_HIGH_IMPORTANCE (16 MB)
1356 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1358 * Returns overload limit according to corresponding message importance
1360 static unsigned int rcvbuf_limit(struct sock
*sk
, struct sk_buff
*buf
)
1362 struct tipc_msg
*msg
= buf_msg(buf
);
1364 if (msg_connected(msg
))
1365 return sysctl_tipc_rmem
[2];
1367 return sk
->sk_rcvbuf
>> TIPC_CRITICAL_IMPORTANCE
<<
1368 msg_importance(msg
);
1372 * filter_rcv - validate incoming message
1376 * Enqueues message on receive queue if acceptable; optionally handles
1377 * disconnect indication for a connected socket.
1379 * Called with socket lock already taken; port lock may also be taken.
1381 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1383 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1385 struct socket
*sock
= sk
->sk_socket
;
1386 struct tipc_sock
*tsk
= tipc_sk(sk
);
1387 struct tipc_msg
*msg
= buf_msg(buf
);
1388 unsigned int limit
= rcvbuf_limit(sk
, buf
);
1391 /* Reject message if it is wrong sort of message for socket */
1392 if (msg_type(msg
) > TIPC_DIRECT_MSG
)
1393 return TIPC_ERR_NO_PORT
;
1395 if (sock
->state
== SS_READY
) {
1396 if (msg_connected(msg
))
1397 return TIPC_ERR_NO_PORT
;
1399 res
= filter_connect(tsk
, &buf
);
1400 if (res
!= TIPC_OK
|| buf
== NULL
)
1404 /* Reject message if there isn't room to queue it */
1405 if (sk_rmem_alloc_get(sk
) + buf
->truesize
>= limit
)
1406 return TIPC_ERR_OVERLOAD
;
1408 /* Enqueue message */
1409 TIPC_SKB_CB(buf
)->handle
= NULL
;
1410 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1411 skb_set_owner_r(buf
, sk
);
1413 sk
->sk_data_ready(sk
);
1418 * backlog_rcv - handle incoming message from backlog queue
1422 * Caller must hold socket lock, but not port lock.
1426 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1430 res
= filter_rcv(sk
, buf
);
1432 tipc_reject_msg(buf
, res
);
1437 * tipc_sk_rcv - handle incoming message
1438 * @sk: socket receiving message
1441 * Called with port lock already taken.
1443 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1445 u32
tipc_sk_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1450 * Process message if socket is unlocked; otherwise add to backlog queue
1452 * This code is based on sk_receive_skb(), but must be distinct from it
1453 * since a TIPC-specific filter/reject mechanism is utilized
1456 if (!sock_owned_by_user(sk
)) {
1457 res
= filter_rcv(sk
, buf
);
1459 if (sk_add_backlog(sk
, buf
, rcvbuf_limit(sk
, buf
)))
1460 res
= TIPC_ERR_OVERLOAD
;
1469 static int tipc_wait_for_connect(struct socket
*sock
, long *timeo_p
)
1471 struct sock
*sk
= sock
->sk
;
1476 int err
= sock_error(sk
);
1481 if (signal_pending(current
))
1482 return sock_intr_errno(*timeo_p
);
1484 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1485 done
= sk_wait_event(sk
, timeo_p
, sock
->state
!= SS_CONNECTING
);
1486 finish_wait(sk_sleep(sk
), &wait
);
1492 * tipc_connect - establish a connection to another TIPC port
1493 * @sock: socket structure
1494 * @dest: socket address for destination port
1495 * @destlen: size of socket address data structure
1496 * @flags: file-related flags associated with socket
1498 * Returns 0 on success, errno otherwise
1500 static int tipc_connect(struct socket
*sock
, struct sockaddr
*dest
,
1501 int destlen
, int flags
)
1503 struct sock
*sk
= sock
->sk
;
1504 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1505 struct msghdr m
= {NULL
,};
1506 long timeout
= (flags
& O_NONBLOCK
) ? 0 : tipc_sk(sk
)->conn_timeout
;
1507 socket_state previous
;
1512 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1513 if (sock
->state
== SS_READY
) {
1519 * Reject connection attempt using multicast address
1521 * Note: send_msg() validates the rest of the address fields,
1522 * so there's no need to do it here
1524 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1529 previous
= sock
->state
;
1530 switch (sock
->state
) {
1531 case SS_UNCONNECTED
:
1532 /* Send a 'SYN-' to destination */
1534 m
.msg_namelen
= destlen
;
1536 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1537 * indicate send_msg() is never blocked.
1540 m
.msg_flags
= MSG_DONTWAIT
;
1542 res
= tipc_sendmsg(NULL
, sock
, &m
, 0);
1543 if ((res
< 0) && (res
!= -EWOULDBLOCK
))
1546 /* Just entered SS_CONNECTING state; the only
1547 * difference is that return value in non-blocking
1548 * case is EINPROGRESS, rather than EALREADY.
1552 if (previous
== SS_CONNECTING
)
1556 timeout
= msecs_to_jiffies(timeout
);
1557 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1558 res
= tipc_wait_for_connect(sock
, &timeout
);
1573 * tipc_listen - allow socket to listen for incoming connections
1574 * @sock: socket structure
1577 * Returns 0 on success, errno otherwise
1579 static int tipc_listen(struct socket
*sock
, int len
)
1581 struct sock
*sk
= sock
->sk
;
1586 if (sock
->state
!= SS_UNCONNECTED
)
1589 sock
->state
= SS_LISTENING
;
1597 static int tipc_wait_for_accept(struct socket
*sock
, long timeo
)
1599 struct sock
*sk
= sock
->sk
;
1603 /* True wake-one mechanism for incoming connections: only
1604 * one process gets woken up, not the 'whole herd'.
1605 * Since we do not 'race & poll' for established sockets
1606 * anymore, the common case will execute the loop only once.
1609 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
1610 TASK_INTERRUPTIBLE
);
1611 if (timeo
&& skb_queue_empty(&sk
->sk_receive_queue
)) {
1613 timeo
= schedule_timeout(timeo
);
1617 if (!skb_queue_empty(&sk
->sk_receive_queue
))
1620 if (sock
->state
!= SS_LISTENING
)
1622 err
= sock_intr_errno(timeo
);
1623 if (signal_pending(current
))
1629 finish_wait(sk_sleep(sk
), &wait
);
1634 * tipc_accept - wait for connection request
1635 * @sock: listening socket
1636 * @newsock: new socket that is to be connected
1637 * @flags: file-related flags associated with socket
1639 * Returns 0 on success, errno otherwise
1641 static int tipc_accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1643 struct sock
*new_sk
, *sk
= sock
->sk
;
1644 struct sk_buff
*buf
;
1645 struct tipc_port
*new_port
;
1646 struct tipc_msg
*msg
;
1647 struct tipc_portid peer
;
1654 if (sock
->state
!= SS_LISTENING
) {
1658 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
1659 res
= tipc_wait_for_accept(sock
, timeo
);
1663 buf
= skb_peek(&sk
->sk_receive_queue
);
1665 res
= tipc_sk_create(sock_net(sock
->sk
), new_sock
, 0, 1);
1669 new_sk
= new_sock
->sk
;
1670 new_port
= &tipc_sk(new_sk
)->port
;
1671 new_ref
= new_port
->ref
;
1674 /* we lock on new_sk; but lockdep sees the lock on sk */
1675 lock_sock_nested(new_sk
, SINGLE_DEPTH_NESTING
);
1678 * Reject any stray messages received by new socket
1679 * before the socket lock was taken (very, very unlikely)
1681 reject_rx_queue(new_sk
);
1683 /* Connect new socket to it's peer */
1684 peer
.ref
= msg_origport(msg
);
1685 peer
.node
= msg_orignode(msg
);
1686 tipc_port_connect(new_ref
, &peer
);
1687 new_sock
->state
= SS_CONNECTED
;
1689 tipc_port_set_importance(new_port
, msg_importance(msg
));
1690 if (msg_named(msg
)) {
1691 new_port
->conn_type
= msg_nametype(msg
);
1692 new_port
->conn_instance
= msg_nameinst(msg
);
1696 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1697 * Respond to 'SYN+' by queuing it on new socket.
1699 if (!msg_data_sz(msg
)) {
1700 struct msghdr m
= {NULL
,};
1702 advance_rx_queue(sk
);
1703 tipc_send_packet(NULL
, new_sock
, &m
, 0);
1705 __skb_dequeue(&sk
->sk_receive_queue
);
1706 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1707 skb_set_owner_r(buf
, new_sk
);
1709 release_sock(new_sk
);
1716 * tipc_shutdown - shutdown socket connection
1717 * @sock: socket structure
1718 * @how: direction to close (must be SHUT_RDWR)
1720 * Terminates connection (if necessary), then purges socket's receive queue.
1722 * Returns 0 on success, errno otherwise
1724 static int tipc_shutdown(struct socket
*sock
, int how
)
1726 struct sock
*sk
= sock
->sk
;
1727 struct tipc_sock
*tsk
= tipc_sk(sk
);
1728 struct tipc_port
*port
= &tsk
->port
;
1729 struct sk_buff
*buf
;
1732 if (how
!= SHUT_RDWR
)
1737 switch (sock
->state
) {
1742 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1743 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1745 if (TIPC_SKB_CB(buf
)->handle
!= NULL
) {
1749 tipc_port_disconnect(port
->ref
);
1750 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1752 tipc_port_shutdown(port
->ref
);
1755 sock
->state
= SS_DISCONNECTING
;
1759 case SS_DISCONNECTING
:
1761 /* Discard any unreceived messages */
1762 __skb_queue_purge(&sk
->sk_receive_queue
);
1764 /* Wake up anyone sleeping in poll */
1765 sk
->sk_state_change(sk
);
1778 * tipc_setsockopt - set socket option
1779 * @sock: socket structure
1780 * @lvl: option level
1781 * @opt: option identifier
1782 * @ov: pointer to new option value
1783 * @ol: length of option value
1785 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1786 * (to ease compatibility).
1788 * Returns 0 on success, errno otherwise
1790 static int tipc_setsockopt(struct socket
*sock
, int lvl
, int opt
,
1791 char __user
*ov
, unsigned int ol
)
1793 struct sock
*sk
= sock
->sk
;
1794 struct tipc_sock
*tsk
= tipc_sk(sk
);
1795 struct tipc_port
*port
= &tsk
->port
;
1799 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1801 if (lvl
!= SOL_TIPC
)
1802 return -ENOPROTOOPT
;
1803 if (ol
< sizeof(value
))
1805 res
= get_user(value
, (u32 __user
*)ov
);
1812 case TIPC_IMPORTANCE
:
1813 tipc_port_set_importance(port
, value
);
1815 case TIPC_SRC_DROPPABLE
:
1816 if (sock
->type
!= SOCK_STREAM
)
1817 tipc_port_set_unreliable(port
, value
);
1821 case TIPC_DEST_DROPPABLE
:
1822 tipc_port_set_unreturnable(port
, value
);
1824 case TIPC_CONN_TIMEOUT
:
1825 tipc_sk(sk
)->conn_timeout
= value
;
1826 /* no need to set "res", since already 0 at this point */
1838 * tipc_getsockopt - get socket option
1839 * @sock: socket structure
1840 * @lvl: option level
1841 * @opt: option identifier
1842 * @ov: receptacle for option value
1843 * @ol: receptacle for length of option value
1845 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1846 * (to ease compatibility).
1848 * Returns 0 on success, errno otherwise
1850 static int tipc_getsockopt(struct socket
*sock
, int lvl
, int opt
,
1851 char __user
*ov
, int __user
*ol
)
1853 struct sock
*sk
= sock
->sk
;
1854 struct tipc_sock
*tsk
= tipc_sk(sk
);
1855 struct tipc_port
*port
= &tsk
->port
;
1860 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1861 return put_user(0, ol
);
1862 if (lvl
!= SOL_TIPC
)
1863 return -ENOPROTOOPT
;
1864 res
= get_user(len
, ol
);
1871 case TIPC_IMPORTANCE
:
1872 value
= tipc_port_importance(port
);
1874 case TIPC_SRC_DROPPABLE
:
1875 value
= tipc_port_unreliable(port
);
1877 case TIPC_DEST_DROPPABLE
:
1878 value
= tipc_port_unreturnable(port
);
1880 case TIPC_CONN_TIMEOUT
:
1881 value
= tipc_sk(sk
)->conn_timeout
;
1882 /* no need to set "res", since already 0 at this point */
1884 case TIPC_NODE_RECVQ_DEPTH
:
1885 value
= 0; /* was tipc_queue_size, now obsolete */
1887 case TIPC_SOCK_RECVQ_DEPTH
:
1888 value
= skb_queue_len(&sk
->sk_receive_queue
);
1897 return res
; /* "get" failed */
1899 if (len
< sizeof(value
))
1902 if (copy_to_user(ov
, &value
, sizeof(value
)))
1905 return put_user(sizeof(value
), ol
);
1908 /* Protocol switches for the various types of TIPC sockets */
1910 static const struct proto_ops msg_ops
= {
1911 .owner
= THIS_MODULE
,
1913 .release
= tipc_release
,
1915 .connect
= tipc_connect
,
1916 .socketpair
= sock_no_socketpair
,
1917 .accept
= sock_no_accept
,
1918 .getname
= tipc_getname
,
1920 .ioctl
= sock_no_ioctl
,
1921 .listen
= sock_no_listen
,
1922 .shutdown
= tipc_shutdown
,
1923 .setsockopt
= tipc_setsockopt
,
1924 .getsockopt
= tipc_getsockopt
,
1925 .sendmsg
= tipc_sendmsg
,
1926 .recvmsg
= tipc_recvmsg
,
1927 .mmap
= sock_no_mmap
,
1928 .sendpage
= sock_no_sendpage
1931 static const struct proto_ops packet_ops
= {
1932 .owner
= THIS_MODULE
,
1934 .release
= tipc_release
,
1936 .connect
= tipc_connect
,
1937 .socketpair
= sock_no_socketpair
,
1938 .accept
= tipc_accept
,
1939 .getname
= tipc_getname
,
1941 .ioctl
= sock_no_ioctl
,
1942 .listen
= tipc_listen
,
1943 .shutdown
= tipc_shutdown
,
1944 .setsockopt
= tipc_setsockopt
,
1945 .getsockopt
= tipc_getsockopt
,
1946 .sendmsg
= tipc_send_packet
,
1947 .recvmsg
= tipc_recvmsg
,
1948 .mmap
= sock_no_mmap
,
1949 .sendpage
= sock_no_sendpage
1952 static const struct proto_ops stream_ops
= {
1953 .owner
= THIS_MODULE
,
1955 .release
= tipc_release
,
1957 .connect
= tipc_connect
,
1958 .socketpair
= sock_no_socketpair
,
1959 .accept
= tipc_accept
,
1960 .getname
= tipc_getname
,
1962 .ioctl
= sock_no_ioctl
,
1963 .listen
= tipc_listen
,
1964 .shutdown
= tipc_shutdown
,
1965 .setsockopt
= tipc_setsockopt
,
1966 .getsockopt
= tipc_getsockopt
,
1967 .sendmsg
= tipc_send_stream
,
1968 .recvmsg
= tipc_recv_stream
,
1969 .mmap
= sock_no_mmap
,
1970 .sendpage
= sock_no_sendpage
1973 static const struct net_proto_family tipc_family_ops
= {
1974 .owner
= THIS_MODULE
,
1976 .create
= tipc_sk_create
1979 static struct proto tipc_proto
= {
1981 .owner
= THIS_MODULE
,
1982 .obj_size
= sizeof(struct tipc_sock
),
1983 .sysctl_rmem
= sysctl_tipc_rmem
1986 static struct proto tipc_proto_kern
= {
1988 .obj_size
= sizeof(struct tipc_sock
),
1989 .sysctl_rmem
= sysctl_tipc_rmem
1993 * tipc_socket_init - initialize TIPC socket interface
1995 * Returns 0 on success, errno otherwise
1997 int tipc_socket_init(void)
2001 res
= proto_register(&tipc_proto
, 1);
2003 pr_err("Failed to register TIPC protocol type\n");
2007 res
= sock_register(&tipc_family_ops
);
2009 pr_err("Failed to register TIPC socket type\n");
2010 proto_unregister(&tipc_proto
);
2018 * tipc_socket_stop - stop TIPC socket interface
2020 void tipc_socket_stop(void)
2022 sock_unregister(tipc_family_ops
.family
);
2023 proto_unregister(&tipc_proto
);